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Lidar-Assisted Feedforward Individual Pitch Control to Compensate Wind Shear and Yawed Inflow

Wortmann, Svenja and Geisler, Jens and Konigorski, Ulrich (2016):
Lidar-Assisted Feedforward Individual Pitch Control to Compensate Wind Shear and Yawed Inflow.
In: Journal of Physics: Conference Series, pp. 052014, 753, (5), [Online-Edition: http://stacks.iop.org/1742-6596/753/i=5/a=052014],
[Article]

Abstract

Lidar-assisted individual pitch control (IPC) has been investigated occasionally in recent years, focusing on the compensation of (vertical) wind shear as the main disturbance. Since yawed inflow might cause significant load fluctuations too, it is worth to compensate. Load patterns caused by yawed inflow significantly differ from those caused by wind shear, requiring a more sophisticated control algorithm. In this paper a lidar-assisted cyclic pitch feedforward control to compensate wind shear and yawed inflow is presented. The main objective is the analysis of the load patterns through a simplified aerodynamic model, which among other things focuses on a reasonable representation of the skewed wake effect. Establishing a suitable structure of the feedforward controller follows. The paper concludes with a comparison of fatigue load reductions achieved by three different controllers. Firstly, a well-known feedback individual pitch control; secondly, a feedforward controller for pure wind shear compensation and thirdly, this new feedforward controller to compensate wind shear and yawed inflow. The last two controllers use ideal lidar measurement chains.

Item Type: Article
Erschienen: 2016
Creators: Wortmann, Svenja and Geisler, Jens and Konigorski, Ulrich
Title: Lidar-Assisted Feedforward Individual Pitch Control to Compensate Wind Shear and Yawed Inflow
Language: English
Abstract:

Lidar-assisted individual pitch control (IPC) has been investigated occasionally in recent years, focusing on the compensation of (vertical) wind shear as the main disturbance. Since yawed inflow might cause significant load fluctuations too, it is worth to compensate. Load patterns caused by yawed inflow significantly differ from those caused by wind shear, requiring a more sophisticated control algorithm. In this paper a lidar-assisted cyclic pitch feedforward control to compensate wind shear and yawed inflow is presented. The main objective is the analysis of the load patterns through a simplified aerodynamic model, which among other things focuses on a reasonable representation of the skewed wake effect. Establishing a suitable structure of the feedforward controller follows. The paper concludes with a comparison of fatigue load reductions achieved by three different controllers. Firstly, a well-known feedback individual pitch control; secondly, a feedforward controller for pure wind shear compensation and thirdly, this new feedforward controller to compensate wind shear and yawed inflow. The last two controllers use ideal lidar measurement chains.

Journal or Publication Title: Journal of Physics: Conference Series
Volume: 753
Number: 5
Divisions: 18 Department of Electrical Engineering and Information Technology > Institut für Automatisierungstechnik und Mechatronik
18 Department of Electrical Engineering and Information Technology > Institut für Automatisierungstechnik und Mechatronik > Control Systems and Mechatronics
18 Department of Electrical Engineering and Information Technology
Date Deposited: 05 Oct 2016 11:46
Official URL: http://stacks.iop.org/1742-6596/753/i=5/a=052014
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